SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6023be896ba065ed36df6839c909c2f68d5e3817ae87a89b7bc297666c9628' 
  AND token = 'RgZ0YiyiihCLVftBor/GX16jQwwOQ7xzyouQOZHufd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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