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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34568c95352e6a7eee10c230c4f6fe97f2d65eca3ce0c898781623bdf73a1077' 
  AND token = 'Ldi11LSwmu4Iu3WTZlrg1aJ1/Y15zCb0XUe23gozR04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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