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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913b62a73539ba84817e7e901c2ed92f67854ae3d535003e15c9ead9b457acde' 
  AND token = 'FjtOYFPzAAkalxutx/GSd6FSR5ANxMiYfEhr7HSr8iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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