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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571825fc3709f98bb22ac35a390aedc55ad86cd56cfaffaea869a2ccb37d322c' 
  AND token = 'CkDNfnASy5hXW8A+eq15JrxdwHqxagCggf2F8oH2Mpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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