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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d34e475590b23c457dec75930cec2b2f4637d7ee779f3570ee7228bffb899b' 
  AND token = 'VloIlnGrA6rWLoXLivS2JsG6VyCQn3f3upmGuyrBjG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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