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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523d7db13f682e064f0ff6382dba58dc323536dbb377600dc213e6adf41a3bbc' 
  AND token = 'QR3jUpEFSHWgtYzmy8OcYMS4RJo8WlAcNPfSoNp84AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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