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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fe7815b25a6bc26621b301283634adccbc03d8855f03c31ad0a4308a39ddaf' 
  AND token = '7bjz8JcUAOQwWK0nf3vjTGZp33/W7232/XXPQFDvF50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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