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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7568822549cbc08246e27481113f067bff149f82928c11f6600d0f2c292585' 
  AND token = 'vl0W1my+1omKKXfJy+QkX+xVY1cs7gt+hUNYwsa5JMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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