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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082ccc2da14b11a687ae2dd588288e914a64c632b5b9bc46cf331cbbe28986ea' 
  AND token = 'BNyhlT8zkbfb45/JEpRn9L6Lg+5ZdSI95Z+YXYpuGTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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