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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1771afb761babdaed38acb869fcf98c4f318ed040ce469f0d0f1253719c314' 
  AND token = 'QFUT98GlvxElyaRkC9gE0swLPBk4a9vN1YIyCYnlAyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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