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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f34aa1cc6b236c57b467525458a70bf48e660ce192a3ebc6f915a198bf4b5c2' 
  AND token = 'RutzmvS13CtM58EnussY4Kl8W4vmwx3D8asch67uJIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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