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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcc015c7c6ec32b40ad0c4bd33dc91bdbbce8322d8c7c8f4f009106b6b9f73c' 
  AND token = 'eLhurC6AEJEiKTwDogkiBgK+BskqQmvt62Vg1VFgcxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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