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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602b3e6dbafe101c7aafbd922507c265bdb893e2c5c82dfefd40c80ea3834adc' 
  AND token = 'RPnDW+vRcngVqKu8NFo1oOIimOfyGbK6l1mcwOmtWcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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