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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6311a7bad94611739b99f743793e785ab0926548a0af28d716792c1409b29e' 
  AND token = 'KBQQvLCts9BN2tZR5jmQppd9o4D8IV9xdCgy3Jw5rjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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