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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '449fdf68f14b8830239b7deada39993ac98233050a3996b91cd57fa4284bd5a0' 
  AND token = 'sXdvadtSiEDgaqor/5HCFIDa4CxouM1+x/6qzHs8Lw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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