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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9266e99b7a61236cb65fcec558ca08eb16db32d589b1fdc5ba420f6c051f5e' 
  AND token = '7NTakH2YSVlHgPwSLIddc2hjXrHKek6TWRFPNHg+uYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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