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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205893960b34bc41440fe674e99068cf32dbab71e9a85d1be43d609e51aa6741' 
  AND token = 'cu/ELXqNKMZ/8aTeL13/BZwaJn5YCy/CWV/Q8S+eJw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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