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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f60bb57bdc02d5546ce039fdd6d0a26cb096658c295fbcd7515e34f1ddcd88e' 
  AND token = 'VfMbfT6OHJ+PiULChP6Cm55VlG9nU7PUZOEu2/PscwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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