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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d1630b5ca9778f411909debbb84be6bb026f5d0bde7e870b4c6af857028e06' 
  AND token = 'F1OqBEFloGMzc4ohO37Akdr55ncaojrZl1kxCuoe8xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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