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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3859308f52b799a816dade15cd808d69dbb6601184e487dce43d9e16098987' 
  AND token = 'fmTa5QRQiTWrYLM5zeYLTGttNm8Zwovq2mE9dOt/I2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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