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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82da98f87fca841eb122abe2d8372a9c9b3c45ccf3684086e38236213b55a85' 
  AND token = 'BlBZaieWCIs5ruJCuxaDsFY4dmF50oacxhkBXiR0IVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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