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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372deeab81d485e7c07e7cf1149595e860ac94efa5b3e8d1897d1321dea23372' 
  AND token = 'V4O/h9gmoik7zbkBttN0yFVP7dQjXerTESOEO89jBDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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