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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6815616b7dcefba6a6ec47d5047519105df82d6e2ecbae7fd9243ddacdfc362' 
  AND token = 'uezFZNq0YCz0V/wqsE6W/70RVJLOjX3Rz7Ojkvd7fMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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