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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6872719bad841c67496db5a0bd9ccb09bfc639a1b8e909e6793195c0a248b1b' 
  AND token = 'bMNO9lIHt20CTfmPr36x1GonsXeLZVdJ2gZKrvozJKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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