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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a866a8f908604522cb33d5ec87fa501b201aa01db338e710db7dd3b622112f' 
  AND token = 'q86y/Qa7OxaQYeco8ZbyhZbCw6dr/ob6OwhBz/zLUrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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