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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe049e4832f51fb3b0f6ac1505e30ec2bd5733d2dd3ef259f9663d165043b7be' 
  AND token = '2YjjoHkvAOy2KpjEwxqCinqYwmo3K5WcUm1nd7DYZYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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