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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac44c3460b2d4acdb0dc01f751c592a7888b7ebb9a31e0146ead00a7f568921' 
  AND token = 'p73LWYIAfv1Jw3Ii1xncgxVePtqhHzS88Po4QdMNkcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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