SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b00de746d3fa3fb583ade3eb28b9f6170b6f0094fa1b857595383046471b4c4' 
  AND token = 'TD2v0RRpTiOSD/q+Yx/ZKf86tn7v+WyBHimuBGReH2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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