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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e01b20e82ee5a9dec5cb700f2a64662fe509d398a94c79191b1c695681f1095' 
  AND token = 'VQ78QRcTlJ9Dx0A7HxsLxtjdcPlfJ8pkJHQypQBvsTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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