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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd62b26efc4cd578b12d409f1bb4d0fc7c65bf575d425b442126733b7b6fcb0d' 
  AND token = 'G8dpS4Kq3gkuZD2U2UICeXQ0/oDRTbAL5b/KySV3/14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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