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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26d76764de1f1f822d5c06e3503965f6a42bb264874dcf3d2f7f84202c2bce1' 
  AND token = 'jhAYNd6N4/Vps9bkaOxJ7e6muxKAVDyC8qd1nkqaoJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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