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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f2e0c88d7b5806492cf158f6779fc4564b8193b6de29fdd2ab71fca57a250b' 
  AND token = '6WmKIA+jCbKoiK3Hh2b8xxkq2KC9WjJbe+ZB6bWzyK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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