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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681885cade47d738286e4d9cdaf98263857b0b70ddd354d9640c85b688470460' 
  AND token = 'sd3msvxw76o1cJgxk7DpGfc+O8+wtIR6ECUythR8UV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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