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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e026c583eb058fc5993fb4a4353c37b3eda9597d1c4854464a2005d2fd0730' 
  AND token = 'GaVonjCz611rWu3k+HT+6VnU1PyUi1ZeksDNGbk3vFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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