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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf52a4bb3e54277b951dcc9664315a7c8c36a704d046e5ac2a259b1ec4fdd412' 
  AND token = 'jJioUh1PyfqyfVCJaValekwQEMFKVckoJCraMT3fdDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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