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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3b0ace6591328ef623c0e6e64a84159151a4945d6bc511e1417d5a77b7ae72' 
  AND token = 'u8R2xs4M0msvDXFkosogCy3UbQy7RAH4Cs9t6dBXg+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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