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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19fc3e0a43ba7a11ee96c52d0b5f13cb8079eb2849ebd807e731e461c66149d' 
  AND token = 'SPuThw/OqbLE6bjbzM8Sbj3tPNTcQad01jDdKxJNhqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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