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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b9b47c3c0d6f8695aa03795d497a1fd861c5e48f8d0bed108b0272b61a34b4' 
  AND token = 'qU5wcmCsP8cGwDT8Ghir7YbjYnaPnaowLQ9wzoXA2j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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