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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d922d6d55b744c65201e8c27d6b50c7e20fccd9981099c36e85f219fd14d8c6' 
  AND token = 'GKbQQFkjPUrytDqYROw0MO7Xkx+7/L0Nr3l2x6KHU7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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