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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7622b191fa76f85985d1040082a8eed3984e249140b05a0d68c5b4c85fd390' 
  AND token = '9q98+XBL1R+zrW+AFtPAyDpVpkmL3h2T8UXFs3hBHWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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