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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53cc6afea51fb49abedf0a9a98324d496c3b7c0d76ae6387217893d1ec8527bf' 
  AND token = 'n7Cxodju9oOc5ST8JJ3S8dsQPOwkD51tMPpn9ruJDUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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