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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2551fd4e6008bbbb3315d592bf3ba44af23d1f7b6781bf5e9c4f9dea1124e8ec' 
  AND token = 'RJ7tQf8BkS/Tv92OLcSGP7o95VbD3e7k5H7gwTlizis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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