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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1218bf63893b7e3a9d8ff7ebaecd69ff807b7286eb8698a6e499336b2bc769b' 
  AND token = 'ZI8ErtfOzT8iScQfhj4kIcRPOu5mBzdFRcSIIZzPX6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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