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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd710c724a81a1ec7f4ba7e07c44ed79519bffa4165e98b6a4bf16f438cf29cdf' 
  AND token = '3wIEpmIzierapvaLoM3CIwLpYcZPeQl7ttZKLTSx41w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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