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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97622899a5b63e0df0addeb551bf4ffae5f7f2ee408e5190e0700779abe0cf2d' 
  AND token = 'Rmi/4WGpO7VDz4NZGZ2ed8KgbHXdHoOnB2oMBlL9h4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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