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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585669b45df41783a88dbf60eadc383187f3d18be20fe32f1b28384f9d29792b' 
  AND token = 'PEnrvWQsGRIni0xGkmNPf4yBKDArBrekRYOMfGg/GqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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