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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f575909d200af2d9aba70ccc38c4bfd9df49834baf493a803fb63e76b3136bc' 
  AND token = 'X7G8lt+rqkIHAxhR4M+ThH0AVZcn+8doBxut8re0mMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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