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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec06013ad243590af9f3a0da21a9e3a973010f0b1f004ead903384ce7ba8abc' 
  AND token = 'lXuOVq5SF5jg2tLwTy+jSpFHYH6cvzRbD+8JTb+gZMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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