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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b1dd10764d2511caf8a38a3f629959b5258ba909844ec70dda2bb0ff2686bb' 
  AND token = 'QsvBiJJZmkBOFsEZV2E372klMiYif+Y61PxJn1ZYkgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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