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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f84bb48d20da6921793cfc94ae228272fec179f4fc7e49e39dd63e4c2473342' 
  AND token = 'zkDb1KkNk3grX257v5w5Vxpxxl+qjhvswEgUD38Rff8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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