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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3086ee5ec30913ea108717cc8be4dd276d144f8933e9391bbeae31f24f506f4c' 
  AND token = 'buIJdVVgI29G6fOuphAX7mSOkxgfIeuZaHY3IcAtMl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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