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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a9db7f0798de8e15619f600becea7f6e4c5faf53aa46dd67f27fc5ef744554' 
  AND token = 'sFutnHvYV5jicmS1NLlBACZC/7tcPuuqB05pgxtLN6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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