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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c1ab3d30835cf7082a2038293a28eb7908247b4db82bf2bff4b8c40c7e26db' 
  AND token = 'WqnNfnzgfqe64dhLZ3S5iFYR0Gdx/oKCwR7YISzB6/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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