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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228bb8d02fde530c3f5c7dbda9e31bb1b6df50154326f550af7c2671f3f952ed' 
  AND token = 'xfGf/jSssK4kpKo6EavK918lSKNMKl+HKPRZZhn5GGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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