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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7156a2664c2d43e33b136aa33019a97ca1b7e9b545e221a8536e1f68c9aff2' 
  AND token = 'elyxRu0zRzQ8Uha+dGTeq3tGRR+92UbgjpdljV7MRV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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