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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a529163ca5d9a2456776a8f133131008425979a9ce3665d9c6aa7d55b9aeda3d' 
  AND token = 'Q3unCZKdD3FmVaeHeYWzTA141hWSfyBClYpw5NVVqB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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