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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b0d1c166463d8cc928f4d465a5757fcabbbaf33d0f640b5f393d2ed0d1686d' 
  AND token = 'fIe5PMO5xnec6mFBdGd5Cv4+s3Ca1L7UfGZIqTY4Gm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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