SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5577236bc468a45d3cd90bbf2513542fa359f02b9b4aea256da9e56642120af' 
  AND token = 'BXnxIHQZ++HLGAJDH/LbyJIrviMCYxqT8nlRIEGXzXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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