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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31090534f34ca2a9f66d9a77dff1057c69ac0c53567ae20632761c1b4d47913a' 
  AND token = '7GaUB2a3QdLswur6C1++EmfGjUqLnkQUyzswZe8I6mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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