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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2cc9fa522c54ff18ccaf15b2ce627594927f94618666e99dc347aeeb0a7d3f' 
  AND token = 'M2daV1OWgcVnYnT2F2CaYEJAIvumqs8xYcgvh/nNTD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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