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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4641b5371492473a787b6cabbbd872344f6f039617d18b6c52845bf22618b314' 
  AND token = 'iJl44nixi4KF1y6pzNAGz/4gOmySJ7VeRsuS4IJ9Iqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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