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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47dfa161ba27ccca9bd943e57af4e42f2562c6edbe6867eefc5a7eac513df60' 
  AND token = 'wsjuZV24KNDWp/ToP6j3BIpV7QR7yDTkE3gTE4wc4zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}