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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939738125a00d509841b4963059242327a83018262badf7ca7c2f40c75d7a3f1' 
  AND token = '4pPQIw/ArweNk5KuQV6iteuRdjJw/NiUHszo4hR1jXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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