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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266a750f0c72aa10f203fb46cd7b845391024923c9155561e163d00897a534a7' 
  AND token = '2Dzr+2l+m4dNM6c2zybdVH94tH2nIwZq7dKe7ArGhd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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