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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93abd0718a821dd9f63e47c53012745f5336ad9e8c481949893a669f6a98de3' 
  AND token = 'CDbNp27SS2MqCsW7x78YXEn1KIFWe0PUcZJrODhtFGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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