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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe99f7800af76a23455aa899612868216df113dbf85218c77e0375a6ee5f4703' 
  AND token = 'G1mypW/ckJuAkoietCNpoYJF3ZuXFGcnsJyVL2GhScs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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