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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa9fd6ef8606f360d775f6c06c6f5f6fe63314aab360700413f7999beb6933f' 
  AND token = 'jAkFHAP8CkWL2+EPJEKCOGKMqGcmTe2brWH0f1ZX8j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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