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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab86502b2bcdf619fd93eff6acab75ca78af9dc383e2bd6a94d22472245463e0' 
  AND token = 'QtQ1JLnh8XhL+I1w/Q9kLRkXCh3xPqmEk9mnW9z5MFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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