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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e96264a5588d4b10846a295c823d791c89dd4c35dda3646c75fa77e5e03600b' 
  AND token = '+v1ydA2Sxj/ZvSOcQf2IByGG/Xr76EGbJOU+QNfDKa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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