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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f600a88aea947de43011298788422085b2b39a44ee5fc3e53c48615e12e048' 
  AND token = '4d6c6obm1qDsVtej7Qacmw45GImn60guR73tC2CAAsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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