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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0d6a30e3ef5430940e95b125ce901221af8d6e5ce0fa944d600acbd4d2bc55' 
  AND token = 'VO4BHh1hRAdrSfAMFnJ3hwqBAu32NnYFQElpUWCdSWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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